Vince, the problem I had with my winch was not directly related to how bad this guy was stuck. The switch in the remote stopped working. I was able to power feed the cable out, but not in. I resolved this (temporarily) by taking the remote apart and switching the wires from "out" to "in", so the winch would power in, but not out (but it powered "in" from the "out" position....confused yet????). The big thing to watch out for equipment wise (safety is a different issue I'll touch on in a second), is heat. Simply put, if your winch motor is too hot to touch, it needs to cool off. I have not had any heat related problems with mine, even with long heavy pulls in the AZ summer temperatures.
Safety wise, the most basic thing that you have to watch for is what will happen if the cable breaks. There is alot of tension on the cable, and it will snap back....very possibly injuring or killing someone in the process. There are a TON of things that will contribute to this happening, but I cannot even begin to explain them all here, even if I possessed the knowledge of all of them. There are a couple of books on the subject, but IMO, it falls into a larger catagory of "vehicle recovery" that would also include use of straps, tow chains, various rigging methods, etc. It would be a disservice for me to try to explain it all. I believe George from Outback Extreme (one of Scott's generous sponsers, and a all around good guy) has some material on the subject. I'll have to look and see if I can find a link for you.